I've been thinking about this a lot lately. I've come up with two comparisons.
Double dutch jump rope. A group setting is like standing at the edge of those spinning ropes, watching the pattern develop so you can find the opportunity to jump in. And then, once you're in, you have to concentrate on the ropes to jump at the right time or else you'll trip up.
And juggling. Juggling one object (one on one conversations) is, well, easy isn't the right word, but I don't know what word fits. It takes a few attempts to get the right feel of it. And it does take effort, so after a time the effort is too much. Add another ball (me and two others), and the effort more than doubles. A third ball (me and three others) is about all I can take; it requires all my concentration. But before long I'll give up and just stand there or more likely slip away unnoticed.
I actually did try to teach myself how to juggle and 3 balls was my limit. I can usually get a few full rotations before I dropped a ball.
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Later,
Kimberly